An official blog post penned by T-Mobile's Chief Technology Officer Neville Ray has trumpeted the company's 4G HSPA+ expansion in five major metropolitan areas, including Chicago, Reno, Fresno, and Sacramento. The new expansion brings the provider's iPhone 5-compatible network to 23 metro areas, and 100 million people.

The post also addresses enhancements being made in Boston, Chicago, Los Angeles, the New York metro area, Philadelphia, and San Diego that are "already experiencing improved coverage and unlocked iPhone 'speed sightings' on T-Mobile’s 4G network."